Questions tagged [hvac]
(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
1,895
questions
4
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0answers
56 views
Why don't HVAC service people want to use outdoor temperature sensors to increase efficiency?
Here in central Virginia, most houses use heat pumps with electric auxiliary heat. I have inquired with several different contractors about installing outdoor thermostats on my units to 1) disable ...
1
vote
2answers
48 views
Plaster Walls Cracking above air vents
My house was built in the 1950's and have plaster walls. I am in the process of repainting and have noticed that the plaster above the baseboard air vents has cracked above almost every vent in the ...
0
votes
0answers
24 views
A/C and furnace [closed]
I am going to have a new gas furnace and A/C installed I have checked and found out that Goodman Equipment is popular in my area. where can I find reviews on this product. Does anyone have experience ...
1
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0answers
19 views
wiring up new air mover
I have a central air system and my squirrel cage fan inside the house started humming and then stopped. I figured it was the capacitor but I found a whole new fan for just a little more. Im having ...
1
vote
1answer
56 views
Sticky black liquid coming from Furnace / AC Unit
I have this sticky black liquid slowly leaking from my gas furnace / ac unit. I called an HVAC repairman and he wasn’t sure what it was. He said he thinks it’s an old drip pan made of tar (not sure ...
0
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0answers
26 views
Can i use my A/C with the front panel/lid just a little bit open?
Using my AC with the front panel/lid just a little bit open prevents it from doing a horrendous sound.
Is it ok to use it like that?
Thanks!
1
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3answers
63 views
How can I seal up this gap on top to make it smellproof
As you can see, at the top of my door there's an open panel with fixed glass panes attached to allow airflow through. How should I best seal that giant gap up so that I can install air-conditioning in ...
2
votes
1answer
55 views
Brand new AC unit makes whooshing sound and air “chokes”
My brand new AC recently started making a whooshing noise. It sounds kind of like a sudden gust of wind, but it repeats every few seconds. Another way I can think of to describe it: imagine a PC ...
1
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2answers
45 views
Should range hood ducting be installed before cabinetry?
When should I install range hood ducting? I am putting in new cabinets. The kitchen has never been vented outside before. The duct work needs to be installed above the cabinets. What needs to be done ...
0
votes
1answer
18 views
Air Conditioning Thermostat Wiring
A set of three air-conditioners cool a storage building in an American sub-tropical environment. There is no heat: AC only. Cooling is signaled by switching the RED (24V) to:
Yellow wire (cooling ...
2
votes
1answer
34 views
Question about adding an HVAC circuit
So am I reading this right? I can use a 30 amp breaker and fused disconnect and thus us a 10ga wire to build this circuit?
1
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1answer
62 views
What kind and size of AC do I need for an enclosed garage workshop?
I am building a workshop / equipment room (computer workbench, hosting servers and network equipment) in my garage. The room will be fully insulated 8'x 12'. Since I'm running some heat producing ...
3
votes
1answer
46 views
Range hood impeller slipping on rotor shaft
My range hood has a motor with an impeller on it. The impeller is attached to the rotor shaft by a nut that threads onto the impeller's... bushing I guess it's called, which is slotted, so that as the ...
0
votes
2answers
44 views
How can I improve recovery time of my hot water baseboard system?
I've just purchased a 15-year old house heated with a gas boiler and multiple baseboard zones controlled with zone valves. The house is built to be energy efficient, and I have no doubt that there'...
1
vote
3answers
74 views
Will an AC compressor work upside down?
If an AC system is designed to keep liquid refrigerant out of the compressor, will the compressor be ok if installed upside down? It should only be dealing with gaseous refrigerant, but I don't know ...
1
vote
1answer
22 views
Forced Hot Air temp out of vents seems too hot
Vents close to heater the temp is up to 130 F. Others further away are less than 100. 130 F just seems so hot metal, registrar would burn your hand if you left it touching. Heater has to run over 7 ...
1
vote
1answer
45 views
Rth5160d1003 New Thermostat wiring from Older 7 Wire Setup o & b wires?
I need help with wiring up the new thermostat. I have a Gas furnace heat with heat pump. Goodman Units. The old thermostat G=GREEN C=BLUE Y=YELLOW R=RED O=ORANGE b=BLACK E=WHITE. The new thermostat ...
2
votes
1answer
47 views
Hot water heating recommendation
I'm looking for a recommendation on the best course to update our hot water heating system.Some background: When we moved into our upstate NY, 2200 sq. ft. home five years ago, the home was heated ...
0
votes
1answer
57 views
How much does it cost to move a furnace from the attic down to the first floor? [closed]
I have a one story slab home and when I moved in two years ago I had to replace the whole unit. I wasn't even thinking about having them put the unit on the first floor. There is a closet(which is a ...
0
votes
1answer
21 views
Is there a small ductless condenser to fit in A/C sleeve?
I own a 350ft studio co-op unit which currently has an old AC unit and two electric baseboards for heat. I was thinking it would be nice if I had a single high hat in the middle of the room connected ...
4
votes
2answers
896 views
Ok to reduce size of return vent grill?
In my living room I had two metal return vents which are both 14 x 12 = 168 square inches, not including the vent slats which are narrow.
As part of a renovation one of those vents is being replaced ...
0
votes
0answers
21 views
Had a slow leak into bathroom ceiling/wall but humidity was low and controlled in that area for 2 weeks. What is mold Risk?
Installed a new furnace humidifier to replace a non-working(probably never used) vintage humidifier 14 days ago in a new place I bought.
Confirmed a small gap let a slow drip from condensation that ...
1
vote
1answer
33 views
Why does my new furnace vibrate and smell like burnt oil?
I just had a new Furnace installed (Goodman GCES960804CN) along with an evap coil
(CE48D44210L004) and AC condenser (GSX140481) on Jan. 9th 2020 by professionals. Everything is new equipment and the ...
0
votes
1answer
20 views
Extend AC hose and install an additional fan
I have an AC in my dorm which works great. During summer I connect the AC via a fitting to the window to cool the room. Due to restructuring of my chamber I want to move the AC in one of the corners ...
0
votes
0answers
20 views
Attic Fan coil short cycles in heat mode
My attic fan coil unit (MBX-HW) fan will short cycle in heat mode. On for 20sec off for 20sec. Worked fine in cool mode last Summer.
Replaced the filter, thermostat replaced 2 years ago. The heat ...
1
vote
1answer
40 views
One Furnace, Dual Zones — Install Sensi on each?
Just bought a new (<6 years old) house and it's two stories, but only has a single furnace in the attic and a single condenser outside. However, there are two thermostats that work (semi) ...
4
votes
1answer
261 views
What is this component wired into a bench grinder motor?
I'm refurbishing an old Black & Decker 6" bench grinder. It's got a power cord, an On/Off switch, and an A/C motor. The motor doesn't energize, even with a manual start, and I'd like to check the ...
1
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0answers
10 views
Heating system cycling
My heating system is power cycling because the heat exhaust temperature sensor is tripping. When I turn the intake gas valve closed a bit, the system will stay on for longer but it's still does some ...
0
votes
0answers
30 views
Keep Purging Heat Every Two Weeks
I have a three zone hydronic heating system. For some reason this year I have had to purge my system every 2-3 weeks because I keep getting air in the pipes. I know this because I hear water start to ...
1
vote
1answer
19 views
One of two Nest Thermostats won't run Fan Only, fan runs with heat though
We've got two Nest Learning Thermostats (3rd Gen) running two separate heating and cooling units in an office. They both work fine for heating and cooling, with one exception: one unit will not turn ...
0
votes
3answers
92 views
(SOLVED) What is a whining, high pitch sound coming from my furnace when heat kicks in
EDIT: SOLVED. IT WAS THE FLEX CONNECTOR. THANKS EVERYONE. My gas furnace makes a high-pitched whining sound when the burners turn on (when I can see fire). A repair man came and told me it may be that ...
0
votes
1answer
22 views
Amana furnace discharge vent seems clogged
My furnace starts out very slowly trying to put out hot air maybe 2 to 3 hours. I think maybe my discharge vent may be clogged but its on a slippery roof and about 30 foot of PVC so how would I clean ...
0
votes
1answer
51 views
Where should my humidistat on my whole house humidifier be located
I have a Trion cm200 installed on my air handler up in the attic of my house. Toward the end of 2018 I had an entire electric system installed in my house (duct work, air handler and outside ...
7
votes
5answers
3k views
Does a thermostat need to be connected to the fuse box? My builder says no?
I just purchased a home, and was in the process of replacing the thermostats with Nests. I flipped off all the circuits in the fuse box, and the thermostat on the first floor powered off. However, the ...
2
votes
4answers
152 views
Considerations for installing a high efficiency furnace in my attic?
I live in Upstate NY and in the winter it gets below 0° F.
I currently have baseboard water heating throughout my home. Prior to this I believe there was a gravity furnace which supplied the house ...
0
votes
1answer
27 views
Tempstar 2 stage furnace restarting every 7 minutes - not going into high
I have a tempstar 9MPT model based furnace. Also sold under a number of other brands - comfort air, etc. It is a two stage heating with a PSC motor high efficiency furnace. After about 7 minutes of ...
2
votes
3answers
73 views
Re-route HVAC around basement window?
Working on my basement and this part of the HVAC covers the corner of that window. Can it be re-routed or reconfigured to fit around the window better? It connects to the kitchen upstairs.
0
votes
2answers
46 views
What should I do with the airflow in a sealed off conditioned crawlspace
First and foremost thanks ahead of time for everyone's help :)
I am in the process of finishing my basement and had some questions/concerns about "what to do with the air" in my crawlspace. In my ...
1
vote
1answer
21 views
HVAC Furnace - Adding C Wire to Older Wiring Style
Hello! Trying to add a smart thermostat to an old system (currently running a mercury thermostat on it).
There is an extra wire (orange) which you can see both inside the thermostat and also in the ...
1
vote
0answers
29 views
Thermostats with or without variable temperature differential (swing)
I am looking at replacing my thermostat, and don't really need or want one with geosync. I am thinking of the honeywell RTH9585wf. Currently I have a lux that is not wifi but programmable. It ...
2
votes
2answers
42 views
Tempstar (ICP) furnace short cycle (runs 10 -15 minutes) then repeats
I have a tempstar (ICP) furnace put in when the house builder built the house. Model is N9MPD075F12A2. Installed late 2009. This problem only happens with the furnace not the AC. When calling for ...
1
vote
2answers
39 views
HVAC Preventative Maintenance
Is it necessary to add bleach or vinegar monthly to HVAC line when system is not in use, mainly when air conditioning and heat are not necessary.
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0answers
19 views
AC compressor runs with heat on. NOT a heat pump
My AC compressor recently started running whenever the heat kicks on. It is not a heat pump. The compressor is a Nordyne fs3ba-036ka.
I haven't done anything to the system aside from changing filters ...
2
votes
0answers
28 views
How to wire Aprilaire 600a to older furnace
I need help wiring an Aprilaire 600a humidifier yo my older oil furnace (from 1998). I thought I had followed the wiring instructions properly, but the digital humidistat is giving me an error code (...
1
vote
0answers
24 views
Furnace sometimes does not start
I have a 5 year old Broan furnace model M7RL 072A AW downflow condensing gas furnace. Here's the furnace startup sequence:
pump runs
ignitor glows
hear the click of the gas valve opening
fires up
...
0
votes
2answers
25 views
A/C compressor connection to the house not sealed anymore. How do I fix it?
The A/C compressor that sits outside our home had a sealed connection to the house (pretty new, 3 years old), and it seems a "gasket" was created with silicone. However, the soil underneath the ...
0
votes
1answer
49 views
Intermittent sewage smell from air ducts
My home is two stories, 5100 sq feet, and was built in 1990. I have a septic system, radon mitigation, and central forced air.
This has gone on for two winters now, but not before that.
The second ...
0
votes
0answers
19 views
I changed my thermostat and now my outside unit won’t turn on
I have a trane heat pump and A/C unit outside and a trane unit inside. I had to replace my thermostat because the one I had, didn’t have emergency heat option on it. I turned off the breaker and ...
1
vote
1answer
52 views
Low Voltage C-Wire at Thermostat
Looking to install an ecobee thermostat and decided to measure my common wire before unhooking anything. I tested the R, C wires and see they are only reading 14v, whereas R,Y, and R,W are reading 28v....
1
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1answer
53 views
Air conditioner locating c wire on old unit
Hi guys I'm trying to figure out I'm using a dual heat and cool thermostat so i decided to get myself a smart thermostat and want to connect both thermostats into 1 but I'm having trouble location the ...
